I've been working on a YCH240B3H0FB. I was told by tech services that I had an air leak on the burner side, which I found on the HSI where it enters the heat exchanger. All of the gaskets on the burner side have been ordered and will be replaced upon arrival. Initial call was for a gas leak/smell throughout store.
Here's my problem. It seems that on initial call for heat, that on the first try to light, refuses to do so. Every time afterwards it will light up and run until the end of the cycle. I thought at first that the combustion blower motor in its wye(star) configuration was bringing in too much air for it to light correctly. To remedy that I tried covering one and then 2 intake ports. No good. Finally I rewired the motor to run it in the delta config on all conditions. It started up harder but would come up to speed in short order. Gas pressure out of valve is in a negative. No matter what I did, the unit wouldn't light up on the initial call.
I'm sure that when I replace all of the gaskets and the turbulators which are pretty much rusted out, that it will start working properly again. I guess I have 2 questions on the matter.
1. Why only on the initial call for heat will the unit not light up? I've never encountered anything like this ever. Its probably caused by the air leak in the system, I was just looking for a cause.
2. Who's idea was it to use a wye(star)-delta motor for the combustion blower motor? It seems to be a bit much for such a small motor. Do these motors need a softer start or something?